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Implications of hot chemical–thermal enhanced oil recovery technique after water flooding in shale reservoirs

机译:热化学热增强油回收技术在页岩储层水中溢水后的影响

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Due to the applicability of hot water injection in the heavy oil production, it has considered as one of the efficient methods in recovery performances. However, its low viscosity has caused to produce lower oil in shale formations. Therefore, hybrid chemical enhanced oil recovery techniques such as foam injection with sequential carbon dioxide injection would be of important in the heavy oil production. In this paper, we aimed to consider induced hot carbon dioxide–foam enhanced oil recovery technique after water flooding at different temperatures. First, we investigated temperature impact on the resistance factor at different gas–oil ratios (henceforth; GOR). Then, polyacrylamide additive (PAM) at different concentrations were added to the foaming agent to increase the foam stability. Oil recovery factor and water cut were measured for each scenario. According to the results of these experiments, temperature increase would cause to resistance factor increase in which the temperature of 180 ° C has the highest resistance factor. It is about 93%. Moreover, increase of GORs has caused to enhance the resistance factor. Polymer concentration increase has caused to resistance factor increase that is related to the polymer property to enhance the foam stabilization. Consequently, by the increase of temperature, water changes from liquid phase to gas or vapor and this is why it has decreased in the first steps of pore volume injection. Therefore, in the temperature of 180 °C, there is not any water cut in the first period of injection. Furthermore, higher polymer concentration would have an important role on the oil recovery increase.
机译:由于热水注射在重油生产中的适用性,它被认为是恢复性能的有效方法之一。然而,它的低粘度使出版物形成较低的油。因此,杂交化学增强的采油恢复技术,如泡沫注射用序贯二氧化碳注射物在重油生产中具有重要意义。在本文中,我们旨在考虑在不同温度下水淹水后诱导的热二氧化碳 - 泡沫增强的采油恢复技术。首先,我们调查了对不同气体油比的电阻因子的温度影响(从此致电; GOR)。然后,将不同浓度的聚丙烯酰胺添加剂(PAM)加入到发泡剂中以增加泡沫稳定性。为每种情况测量储油因子和水切。根据这些实验的结果,温度增加将导致阻力因子增加,其中180℃的温度具有最高的电阻因子。它约为93%。此外,GOR的增加使得增强阻力因子。聚合物浓度增加导致抵抗与聚合物性质有关的因子增加,以增强泡沫稳定化。因此,通过增加温度,水从液相变为气体或蒸气,这就是在孔隙体积注射的第一步中降低的原因。因此,在180°C的温度下,在第一时期没有任何水切口。此外,更高的聚合物浓度对油回收增加具有重要作用。

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